Automatic window-sash lock



Dec. 27, 1932. MCALLISTER 1,891,940

AUTOMATIC WINDOW SASH LOCK Filed Oct. 6. 1951 Patented Dec. 27, 1932 UNITED STATES PATENT GFFIE AUTOMATIC WXNDOYV-SASH LOCK Application filedfictober 6, 1931. Serial No. 567,180. 2

This invention relates to new and useful improvements in a window sash lock.

The invention has for an object the construction of a window sash lock which is characterized by a pivoted cam element and a stationary finger element respectively on the meeting rails of the sashes of a window, and the provision of a means for automatically moving the cam element into a latched position as the window is closed.

A still further object of this invention is the provision of means for normally urging the pivoted cam into a latched position and a catch for holding the cam in the opened position.

As another object of this invention it is proposed to provide a means for snapping the catch as the window is closed to cause latching of the cam element.

Furthermore, this invention has for another object the provision of an arm hingedly mounted upon the cam element for swinging in the vertical and having a pin on its bottom side engaging through apertures in the cam and in the support of the cam for constituting latching of these parts together.

It is also proposed to provide a trip swivelly mounted for moving in the horizontal upon the finger element and arranged for causing motion of the pivoted arm to operate the automatic latching of the window.

A still further object of this invention is the provision of means for holding the trip in an inoperative position to eliminate the automatic latching operation when thus de sired.

A still further object of this invention is the construction of an article of the class mentioned which is of simple. durable construction, dependable in use and efiicient in operation and which can be manufactured and sold at a reasonable cost. 7

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In thea'ccompanying drawing forming material part of this disclosure Fig. 1 is a plan view of the meeting rails of a window having an inner and outer sash.

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1.

Fig. 4; is an enlarged detailed sectional view taken on the line 4.4 of Fig. 1.

Fig. 5 is a view similar to Fig. 4 but illustrating a modification.

Fig. 6 is a fragmentary vlew similar to portion of Fig. 1 but illustrating a form of the invention shown in Fig. 5.

attached upon the inner sash 11. The pivotal connection is accomplished by means of stud 15 connected with the cam 13 and extending into a hollow portion 16 of the standard 14. A finger 17 is firmly attached upon the meeting rail of the outer sash 12. The cam 13 is so formed that when rotated it engages beneath the finger 17 so as to draw the meeting rails together as well as latch the inner and outer sashes against being moved. This latching operation is old in the art and therefore further details will not be given there.

A means is provided for urging the cam 13 into its latching position.

This means comprises acoil spring 18 upon the'stud 15 and having one end attached on the standard 14 and the other end upon the stud 15. An arm 19 is pivotally hinged at one end 20 upon cam 13 and extends from the edge of the mee ing rail towards the finger 17. Spring 19 urges the arm dowmvards.

The base of the cam 13 is recessed slightly, indicated by referenee numeral 21, so that the arm may normally rest therein. A pin 22 is attached upon the bottom of the arm 19 and is engageable in apertures extending through the cam 13 and the standard 14 to latch the cam in its opened position.

A trip 23 in the form of a triangular piece is pivotally mounted at oneapex 24 upon boss 25 connected with the finger bracket 1 This triangular trip is normally urged towards the cam 13 by reason of a spring 26 which extends through an aperture in the trip and an aperture in the pintle bolt 27 which pivotall supports the trip. The spring 26 allows the trip 23 to pivot either to the right or the left through a small amplitude. In Fig. 1, dot and dash lines 28 indicate a pivoted position of the trip towards the rack.

The operation of the device may be traced by assuming the pin 22 engaged within the apertures in the cam 13 and the standard 14 so that the cam is held in an opened position. When the window sashes are moved to the closed position, the free end of the arm 19 strikes against the trip 23 so that the arm is moved to a relatively raised position and the pin removed from the openings. Thereupon, the spring 18 will swivel the cam 13 around so as to cause it to engage the finger 17 and lock the window. The right hand end 13, as illustrated in Fig.1 will engage against the side of the trip 23 so as to move it towards the left into an idler position.

The cam 13 may be manually moved to the open position illustrated in Fig. 1,'while the window is in its fully closedposition. This will result in the lever 19.acting against the side of the trip 25 so as to move it to the posiaccomplish this result.

tion indicated by the 'dotand dash lines 28. Consequently, the trip cannot disengage the pin 22 from its aperture and the catch will be opened. This arrangement allows the window to be opened the next time. But, upon subsequent closing of the window-sashes, the free end of the lever 19 will again engage the trip 23 to cause automatic closing of the window lock. 7

In Figs. 5 and 7 a modification of the invention has been disclosed in which a means is provided for holding the trip in an inoperative position so that irrespective of the number ofv times that the window sashes are opened and closed the trip will maintain its inoperative position. The feature of this construction is the simplicity of the parts to The trip 23 has a circular top recess 30 through which a pintle pin 31 extends for accomplishing the-pivotal supporting of the trip at 24. A co-axial spring 32 is arranged upon the pin 30 which acts be tween the pin and the trip for normally urging the trip 23 into its operative position, that is, the full line position shown in Fig. 1. The spring 32 is opened undercompression so as to tend to lower the trip 23 if it obtains the chance. top of the boss. 25 in an idler position of the Another recess 33 is formed in the trip so that when the trip is rotated to the position of the recess it is automatically moved downwards by the expansion of the spring 32 and thus maintains the position.

WVhile I have shown and described the preferred embodiment of my invention, it is to be understood that I do not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is 1. In a latch for the meeting rails of a window having an inner and an outer sash, having a pivoted cam element on the inner sash engageable with a stationary finger element on the outer sash and means for urging said cam into a latching position, an arm hinged on said cam for moving in the vertical and having a bottom pin engageable through apertures in the cam and a stationary member beneath the cam for holding the cam in its unlatched position, a trip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urging said trip towards said finger.

2. In a latch for the meeting rails of a window having an innerand an outer sash, having a pivoted cam element on the inner v sash engageable with a stationary finger element on the outer sash and means for urging said cam'into a latching position, an arm hinged on said cam for moving in the vertical and having a bottom pin engageable through apertures in the cam and a stationary memberbeneath the cam for holding the cam in its unlatched position, a trip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urging said triptowards said finger, a portion of said cam being recessed in the vicinity of said arm. 1 I

3.- In a latch for the meeting rails of a window having. an inner and an outer-sash, having a. pivoted cam element on the inner sash engageable with a stationary finger element on the outer sash and means for urging said cam into a latching position, an arm hinged-on said cam for moving in the vertical and having a bottom pin engage-able through apertures in the cam and a stationary member beneath the cam for holding thecam in its unlatched position, atrip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urging said trip towards said finger, said trip being of triangularf-orm with a base normally extended towards the cam.

4. In a latch for the meeting rails of a window having an inner and an outer sash, having-a pivoted cam element on the inner sash engageable with a stationary finger element on the outer sash and means for urging said cam into a latching position, an arm hinged on said cam for moving in the vertical and having'a bottom pin engageable through apertures in the cam and a stationary member beneath the cam for holding the cam in its unlatched position, a trip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urgingsaid trip towards said finger, comprising a Hat spring engaged through a passagewithin the trip and within a stationary pintle pin which supports the trip.

5. In a latch for the meeting rails of a window having an inner and an outer sash, having a pivoted cam element on the inner sash engageable with a stationary finger element on the outer sash and means for urging said cam into a latching position, an arm hinged on said cam for moving in the vertical and having a bottom pin engageable through apertures in the cam and a stationary member beneath the cam for holding the cam in its unlatched position, a. trip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urging said trip towards said finger, comprising a spring co-axially upon a pintle which swivelly supports said trip, said spring being under tension to urge the trip downwards and a recessed opening at an idler position of the trip so that said spring may urge the trip therein for holding it in an inoperative position.

6. In a latch for the meeting rails of a window having an inner and an outer sash, having a pivoted cam element on the inner sash engageable with a stationary finger element on the outer sash and means for urging said cam into a latching position, an arm hinged on said cam for moving in the vertical and having a bottom pin engageable through apertures in the cam and a stationary member beneath the cam for holding the cam in its unlatched position, a trip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urging said trip towards said finger, a portion of said cam being recessed in the vicinity of said arm, and means for normally urging the arm downwards into the said recess.

7. In a latch for the meeting rails of a window having an inner and an outer sash, having a pivoted cam element on the inner sash engageable with a. stationary finger element on the outer sash and means for urging said cam into a latching position, an arm hinged on said cam for moving in the vertical and having a bottom pin engage-able through apertures in the cam and a stationary member beneath the cam for holding the cam in its unlatched position, a trip swivelly held on the finger element in a manner to move in the horizontal, and resilient means for urging said trip toward said finger, a portion of said cam being recessed in the vicinity of said arm, and means for normally urging the arm downwards into the said recess, comprising a fiat spring fixed upon the cam element and engaging down upon the arm.

In testimony whereof I have affixed my signature.

HARRY ELY MGALLISTER. 

